package com.litianhao.nowcode.config;

import com.litianhao.nowcode.util.CommunityConstant;
import com.litianhao.nowcode.util.CommunityUtil;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.access.AccessDeniedException;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.builders.WebSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
import org.springframework.security.core.AuthenticationException;
import org.springframework.security.web.AuthenticationEntryPoint;
import org.springframework.security.web.access.AccessDeniedHandler;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;

/**
 * @author litianhao
 * @create 2020-06-08 9:43
 */
@Configuration
public class SecurityConfig extends WebSecurityConfigurerAdapter implements CommunityConstant {

    //静态不拦截
    @Override
    public void configure(WebSecurity web) throws Exception {
        web.ignoring().antMatchers("/resources/**");
    }

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        //授权  下面这些路径，都必须在登录的情况下才可以访问     其余路径不需要
        http.authorizeRequests()
                .antMatchers(
                        "/user/setting",
                        "/user/upload",
                        "/discuss/add",
                        "/comment/add/**",
                        "/letter/**",
                        "notice/**",
                        "/like",
                        "/follow",
                        "/unfollow"
                )
                .hasAnyAuthority(
                        AUTHORITY_USER,
                        AUTHORITY_ADMIN,
                        AUTHORITY_MODERATOR
                )
                .anyRequest().permitAll()
                .and().csrf().disable();

        //权限不够的时候
        http.exceptionHandling()
                .authenticationEntryPoint(new AuthenticationEntryPoint() {
                    //没有登录
                    @Override
                    public void commence(HttpServletRequest request, HttpServletResponse response, AuthenticationException e) throws IOException, ServletException {
                        //判断请求是同步还是异步
                        String xRequestedWith = request.getHeader("x-requested-with");
                        if("XMLHttpRequest".equals(xRequestedWith)){
                            //异步请求
                            response.setContentType("application/plain;charset=utf-8");
                            PrintWriter writer = response.getWriter();
                            writer.write(CommunityUtil.getJSONString(403,"你还没有登录哦"));
                        }else{
                            response.sendRedirect(request.getContextPath()+"/login");
                        }
                    }
                })
                .accessDeniedHandler(new AccessDeniedHandler() {
                    //权限不足
                    @Override
                    public void handle(HttpServletRequest request, HttpServletResponse response, AccessDeniedException e) throws IOException, ServletException {
                        //判断请求是同步还是异步
                        String xRequestedWith = request.getHeader("x-requested-with");
                        if("XMLHttpRequest".equals(xRequestedWith)){
                            //异步请求
                            response.setContentType("application/plain;charset=utf-8");
                            PrintWriter writer = response.getWriter();
                            writer.write(CommunityUtil.getJSONString(403,"你没有访问此功能的权限"));
                        }else{
                            response.sendRedirect(request.getContextPath()+"/denied");
                        }
                    }
                });

        //Security底层默认拦截/logout请求，进行退出处理
        //我们想覆盖他默认的逻辑，才能执行我们自己的退出代码
        http.logout().logoutUrl("/securitylogout");
    }
}
